Electrochemical Concentration Recirculation for Scaling Prevention
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Solution Overview
Problem
Electrochemical separation devices face challenges in efficiently managing ionic concentration and preventing scaling and precipitation in the concentration compartment, particularly when treating waters with low salinity or high salinity, which affects recovery rates and energy consumption.
Innovation Solution
The method involves periodically discharging a volume of the reject stream with a high concentration of ions in a timed batch cycle and replacing it with a feed stream of lower ion concentration, coordinated with electrode polarity reversal and flow path exchange, to maintain optimal ionic balance and prevent scaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous recirculation of reject stream is used to maintain ionic balance, then scaling and precipitation are prevented, but energy consumption increases and recovery rates decrease
Solution Approach 1:
The patent implements periodic batch discharge of concentrate at predetermined intervals instead of continuous recirculation. The system accumulates concentrate in the concentration compartment until a threshold is reached, then discharges it in batches. This periodic action reduces the continuous energy input required for pumping and maintains ionic balance through controlled intermittent removal rather than constant recirculation.
2Productivity
If high recovery rates are achieved by minimizing reject discharge, then energy consumption is reduced, but scaling and precipitation occur in the concentration compartment
Solution Approach 1:
The system incorporates monitoring of ionic concentration in the concentration compartment and uses this feedback to trigger batch discharge operations. When the concentrate reaches a predetermined concentration threshold that indicates impending scaling or precipitation, the system automatically initiates discharge. This feedback-controlled approach ensures discharge occurs only when necessary to prevent scaling, thereby maximizing recovery rates while avoiding harmful precipitation.
3Use of energy by moving object
If batch timed cycle discharge is used to reduce energy consumption, then recovery rates improve, but complex coordination with polarity reversal and flow path exchange is required
Solution Approach 1:
The patent combines multiple operations into a single coordinated batch timed cycle: concentrate accumulation, polarity reversal, flow path exchange, and discharge all occur within integrated time cycles. By merging these operations and synchronizing them to occur in sequence within predetermined time frames, the system reduces the need for separate control mechanisms while maintaining energy efficiency and preventing scaling through coordinated action.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances recovery rates, reduces energy consumption, and prevents scaling and precipitation, allowing for longer cycle durations and more consistent product quality.
Implementation Method 1
an ion exchange membrane positioned between the dilution compartment and the concentration compartment
Implementation Method 2
first and second electrodes positioned at distal ends of the electrochemical separation device
Implementation Method 3
periodically reversing a polarity of the first and second electrodes
Data Source
AI summary
A method of operating an electrochemical device includes periodically discharging a volume of concentrate reject in a timed batch cycle and replacing the concentrate reject with feed water. An electrochemical water treatment system includes a recycle line having a valve controlled by a control module. The control module periodically opens the valve to discharge concentrate reject from the recycle line in a batch timed cycle. The recycle line is fed with feed water to replace the discharged concentrate reject.